血小板粘附率的正常参考范围是（）
A.53％～70％
B.40％～50％
C.大于70％
D.小于40％
E.大于60％
参考答案：A
化简：-3（2a2-ab）+4（a2+ab-6）
After_____a11 the apples，he____ the biggest one in the basket and handed it to me．
A．picked；picked up
B．picking；picked out
C．picking Out；picked
D．picking up；picked
